403
Cycling Stability of Flexible Positive Electrodes for Li-Ion Batteries Using Nano-Fibrillated Cellulose As a Binder

Tuesday, 10 June 2014
Cernobbio Wing (Villa Erba)
H. Lu, M. Behm, A. Cornell (KTH Royal Institute of Technology), S. Leijonmarck (KTH Royal Institute of Technology, Swerea SICOMP AB), and G. Lindbergh (KTH Royal Institute of Technology)
Li-ion batteries are the most important power source in the application of portable electronics. Flexible Li-ion batteries attract increasing interest and could be very useful in bendable and wearable electronic devices. Nano-fibrillated cellulose (NFC), a renewable material, is a promising candidate as a binder for flexible Li-ion batteries, with good mechanical properties. They can be produced using a water-based paper making process, avoiding the use of toxic solvents. Recent work has shown capacity fading during repeated cycling of the paper based Li-ion batteries, and the traces of moisture in the NFC may be the cause for this degradation[i],[ii]. In the present work, the cycling stability of flexible positive electrodes (Fig. 1) for Li-ion batteries using NFC as a binder is investigated and discussed as function of electrode drying conditions, mainly the time and temperature. Preliminary results show that the cells with longer drying time of the NFC-based electrode obtains a better cycling performance at C/10, as well as a higher coulombic efficiency.